| Hoodoo Mountain(expression, activity, name, volcano, geology) |
| Hudson Mountains(expression, activity, name, volcano, geology) |
| Hunga Tonga(expression, activity, name, volcano, geology) |
| Irazu Volcano(expression, activity, name, volcano, geology) |
| Isabela Island(expression, activity, name, volcano, geology) |
| Jabal Yar(expression, activity, name, volcano, geology) |
| Jabal al-Tair Island(expression, activity, name, volcano, geology) |
| Kanehekili Fluctus(expression, activity, name, volcano, geology) |
| Karpinsky Group(expression, activity, name, volcano, geology) |
| Kasatochi Island(expression, activity, name, volcano, geology) |
| Kick 'em Jenny(expression, activity, name, volcano, geology) |
| Kikai Caldera(expression, activity, name, volcano, geology) |
| Klyuchevskaya Sopka(expression, activity, name, volcano, geology) |
| Kolokol Group(expression, activity, name, volcano, geology) |
| Korovin Volcano(expression, activity, name, volcano, geology) |
| La Grande Soufriere(expression, activity, name, volcano, geology) |
| La Palma(expression, activity, name, volcano, geology) |
| Lake Nyos(expression, activity, name, volcano, geology) |
| Las Derrumbadas(expression, activity, name, volcano, geology) |
| Las Pilas(expression, activity, name, volcano, geology) |